Abstract
Mixture of poly(γ-benzyl L-glutamate) and poly(γ-benzyl D-glutamate) have a special interaction between the benzyl groups at the end of the side chain and have different properties from the pure enantiomorphic form of poly(γ-benzyl glutamate). A reversible first-order transition has been observed and ascribed to the formation and breakdown of stackings of the benzyl groups at the end of the side chain. The isothermal transition was investigated by dilatometry and studied in light of present concepts of crystallization in crystalline polymers. Plots of extent of isothermal transition vs. time were sigmoidal in shape and fitted the Avrami equation. The exponent in the Avrami equation was 4. The reciprocal half-time of the transition was taken as a measure of the overall rate of transition. Plots of logarithm of transition rate against Tm[T(Tm−T)]−1 and Tm2[T(Tm−T)2]−1, where Tm is the temperature for the breakdown of stacking of the benzyl groups, taken as 100.2°C, and T is the stack formation temperature, gave reasonably good straight lines. Thus, as is usually found with polymers, no discrimination could be made between two possible mechanisms of the transition; two-dimensional or three-dimensional nucleations.
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Yoshikawa, M., Tsujita, Y., Uematsu, I. et al. Transition of Mixture of Poly(γ-benzyl L-glutamate) and Poly(γ-benzyl D-glutamate). Polym J 7, 96–100 (1975). https://doi.org/10.1295/polymj.7.96
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DOI: https://doi.org/10.1295/polymj.7.96